Multi-Stripper Hydroprocessing Effluent Segmentation
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Solution Overview
Problem
Hydroprocessing, particularly hydrocracking, is highly energy-intensive due to the severe process conditions, leading to significant heater duty requirements in product fractionation columns, necessitating more efficient recovery methods to meet increasing energy demands.
Innovation Solution
Implementing a process with two or three strippers instead of a single stripper in hydroprocessing units to reduce heater duty by at least 40% and lower capital costs, by separating hydroprocessing effluent streams into cold, warm, and hot streams for dedicated stripping in respective columns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If a single stripper column is used for hydroprocessing effluent, then the process is simpler with lower capital costs, but the heater duty for product fractionation column becomes excessively high
Solution Approach 1:
The single stripper column is divided into multiple separate stripper columns (cold stripper, warm stripper, hot stripper) that process different temperature portions of the hydroprocessing effluent stream. This segmentation allows each stripper to be optimized for its specific temperature range, reducing the overall heater duty required for the product fractionation column while distributing the processing load across multiple units.
2Loss of energy
If hydroprocessing effluent is stripped without temperature separation, then the process is simpler, but energy consumption increases significantly
Solution Approach 1:
The stripping process is differentiated by temperature zones, with cold, warm, and hot strippers each handling effluent at their respective optimal temperature ranges. This local quality approach ensures that stripping occurs under conditions best suited for each temperature segment, maximizing stripping efficiency and minimizing energy consumption in the subsequent fractionation process.
Solution Approach 2:
The effluent stream undergoes preliminary separation into cold, warm, and hot portions before entering the respective stripper columns. This preliminary action based on temperature classification allows each stripper to process pre-sorted streams, optimizing the stripping efficiency and reducing the energy required in downstream processing.
3Use of energy by stationary object
If multiple stripper columns are implemented, then heater duty is reduced by at least 40%, but the number of processing units increases
Solution Approach 1:
The effluent processing is segmented into three temperature-based streams (cold, warm, hot) that are routed to separate stripper columns. This segmentation enables parallel processing of different temperature portions, reducing the overall heater duty by at least 40% while organizing the increased number of units into a systematic, manageable configuration.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces energy consumption and capital expenditures by optimizing the separation process, enhancing energy efficiency and reducing the heater duty for product fractionation columns while maintaining effective product recovery.
Implementation Method 1
a stripper for stripping hydroprocessed effluent with a stripping medium such as steam to remove unwanted hydrogen sulfide
Data Source
AI summary
Two or three strippers are used to strip three hydroprocessed effluent streams, perhaps from a slurry hydrocracking reactor, separated by temperature instead of a single stripper to preserve separations previously made and conserving energy and reducing vessel size. A cold stripped stream may be taken as a diesel blending stock without further fractionation.